The measured losses from tests on five centrifugal fan impellers of different blade angle, running at constant speed in a given volute, are analysed. Impeller and volute losses, expressed as a fraction of the dynamic exit pressure relative to impeller and volute respectively, are correlated with a diffusion factor over a wide volume flow range. The results are applied to other impellers and volutes.
The low volume flow range of operation is also considered.
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References
1.
BusemanA.‘The pump-head ratio of radial centrifugal pumps with logarithmic spiral blades’ (in German), Z. angew. Math. Mech.19288 (5), 372. English Translation: NEL Transl. 90.
2.
StodolaA.Steam and gas turbines, Vol. 2, 1945 (Peter Smith, New York).
3.
StanitzJ. D.‘Some theoretical aerodynamic investigations of impeller in radial-and mixed-flow centrifugal compressors’, Trans. Am. Soc. mech. Engrs195274 (4), 473.
4.
BaljeO. E.‘A contribution to the problem of designing radial turbomachines’, Trans. Am. Soc. mech. Engrs195274 (4), 451.
5.
LewisR. I.‘The mechanism of relative eddy flows in mixed-flow turbomachines’, Proc. Instn mech. Engrs1965–66180 (Pt 3J), 54.
6.
PollardD.‘The extension of Schlichting's analysis to mixed flow cascades’, Thermodynamics and Fluid Mechanics Conv., Proc. Instn mech. Engrs1965–66180 (Pt 3J), 86.
7.
WoodM. D.MarlowA. V.‘The use of numerical methods for the investigation of flow in water pump impellers’, Proc. Instn mech. Engrs1966–67181 (Pt 1), 725.
StepanoffA. J.Centrifugal and axial flow pumps (2nd edition), 1957 (Wiley and Sons, New York).
10.
MylesD. J.‘An investigation of the pressure and velocity distribution in centrifugal pumping machines and the effect on this of varying the exit angles and number of rotor blades’, Ph.D. Thesis, 1959 (London University).
11.
British Standard No. 848: Part 1: 1963. Methods of testing fans for general purposes (British Standards Institution, London).
12.
KeartonW. J.‘The influence of the number of impeller blades on the pressure generated in a centrifugal compressor and on its general performance’, Proc. Instn mech. Engrs1933124, 481.
13.
MylesD. J.DanielM. M.WilsonG.‘An investigation into the stability of mixed-flow blower characteristics’, NEL Rep. No. 252, 1966.
14.
LiebleinS.SchwenkF. C.BroderickR. L.‘Diffusion factor for estimating losses and limiting blade loadings in axial flow compressor blade elements’, NACA Res. Memor. E53D01, 1953.
15.
LiebleinS.‘Analysis of experimental low speed loss and stall characteristics of two-dimensional compressor blade cascades’, NACA Res. Memor. E57A28, 1957.
16.
RaillyJ. W.HoultonJ. M.‘A solution to the direct problem of flow in an arbitrary mixed-flow turbomachine’, NEL Rep. No. 413, 1969.
17.
BurgessA. J.‘The performance of fans in hovercraft—a method of reducing experimental results’, RAE Tech. Rep. No. 65240, 1965.
18.
SchweigerF.‘The flow in centrifugal pumps working at part capacity’, NEL Rep. No. 245, 1966.
19.
WorsterR. C.‘The effects of skin friction and roughness on the losses in centrifugal pump volutes’, BHRA Rep. No. RR557, 1957.
20.
AndersonH. H.Centrifugal pumps1962 (Trade and Technical Press Ltd).
21.
MullerH. P.‘Uberblick über Ergebnisses von Wirking-agradmessnugen an Turbinen und Pumpenanlagen’, Voith Forschung und Konstruktion No. 15 1967 (May).
22.
Hitachi Rev. S1. No. 13 and 16 No. 12.
23.
GibsonN. R.‘Gibson method of efficiency tests of turbines’, Am. Soc. mech. Engrs58A78, 1920–1953.
24.
PeckJ. F.‘Design of centrifugal pumps with computer aid’, Proc. Instn mech. Engrs1968–69183 (Pt 1), 321.
PeckJ. F.‘Investigations concerning flow conditions in a centrifugal pump and the effect of blade loading on head slip’, Proc. Instn mech. Engrs1951164, 1.
